Perhaps you should try some spelling variations:
practical astronomy » nautical astronomy, optical astronomy
astronomy science » astronomy space, astronomy ancient
astronomy sergey » astronomy survey, astronomy surveys, astronomy large
moore practical » more practical, moocs practical, mouse practical
mkie positional » case positional, game positional, gene positional
astronomy seven » astronomy some, astronomy between, astronomy section
patrick mkie » patrick mackie, patrick mein, patrick m

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( the patrick moore practical astronomy sergey ) OR ((( the patrick mkie positional astronomy seven ) OR ( the patrick mkie positional astronomy science )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( the patrick moore practical astronomy sergey ) or ((( the patrick mkie positional astronomy seven ) OR ( the patrick mkie positional astronomy science ))))".
• Adding a wildcard symbol may retrieve word variants: (( the patrick moore practical astronomy sergey ) or ((( the patrick mkie positional astronomy seven ) OR ( the patrick mkie positional astronomy science ))))*.